The product is mildly abrasive and excessive pressure may scratch quartz, especially polished finishes.
Why
Quartz is not explicitly named, but the product is intended for hard household surfaces and no chemical incompatibility is established. The main risk is mechanical scratching from the abrasive paste.
What to do
Use only on a cool surface with a soft cloth or sponge, rub gently, do not let it dry, rinse thoroughly, and test first in an inconspicuous area.
pH
Not stated
Relevant chemistry
Mild abrasive paste cleaner; not classified as hazardous under GHS.
Source: official product page ↗